EP0775195A1 - Procede de fabrication de barres transparentes pour l'hygiene personnelle - Google Patents

Procede de fabrication de barres transparentes pour l'hygiene personnelle

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Publication number
EP0775195A1
EP0775195A1 EP95928144A EP95928144A EP0775195A1 EP 0775195 A1 EP0775195 A1 EP 0775195A1 EP 95928144 A EP95928144 A EP 95928144A EP 95928144 A EP95928144 A EP 95928144A EP 0775195 A1 EP0775195 A1 EP 0775195A1
Authority
EP
European Patent Office
Prior art keywords
parts
soap
bar
personal cleansing
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP95928144A
Other languages
German (de)
English (en)
Inventor
Benjamin Carl Wiegand
Alejandro Figueroa
Michael August Brunsman
Alexandre Zyngier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP0775195A1 publication Critical patent/EP0775195A1/fr
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/0095—Solid transparent soaps or detergents
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D10/00—Compositions of detergents, not provided for by one single preceding group
    • C11D10/04—Compositions of detergents, not provided for by one single preceding group based on mixtures of surface-active non-soap compounds and soap
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D10/00—Compositions of detergents, not provided for by one single preceding group
    • C11D10/04—Compositions of detergents, not provided for by one single preceding group based on mixtures of surface-active non-soap compounds and soap
    • C11D10/042—Compositions of detergents, not provided for by one single preceding group based on mixtures of surface-active non-soap compounds and soap based on anionic surface-active compounds and soap
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/30—Amines; Substituted amines ; Quaternized amines
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/04—Carboxylic acids or salts thereof
    • C11D1/06—Ether- or thioether carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/04—Carboxylic acids or salts thereof
    • C11D1/10—Amino carboxylic acids; Imino carboxylic acids; Fatty acid condensates thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/126—Acylisethionates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
    • C11D1/146—Sulfuric acid esters
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/16—Sulfonic acids or sulfuric acid esters; Salts thereof derived from divalent or polyvalent alcohols
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/28—Sulfonation products derived from fatty acids or their derivatives, e.g. esters, amides
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/29—Sulfates of polyoxyalkylene ethers
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/34—Derivatives of acids of phosphorus
    • C11D1/345—Phosphates or phosphites
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/12—Soft surfaces, e.g. textile
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2003—Alcohols; Phenols
    • C11D3/2065—Polyhydric alcohols

Definitions

  • This invention relates to a monohydric-alcohol-free process for making pour molded transparent and translucent personal cleansing bars.
  • the transparent personal cleansing bars prepared according to this process exhibit good hardness characteristics and are mild to the skin, low smearing and good lathering.
  • Transparent personal cleansing bars are well known in the art and are considered desirable by many consumers. Unfortunately, a problem in formulating transparent personal cleansing bars is that, either they can be too harsh, as in the case of bars containing high levels of soap, or they can require the use of monohydric alcohols, or they can be undesirably soft.
  • high soap bar Like other "high soap" transparent bars, the bars disclosed by Instone et al. have good lather, low smear, and good bar hardness. Such high soap level transparent bars, however, are rather harsh to the skin.
  • Another drawback to such bars is that their processing generally require the use of an undesirable solvent, such as volatile short chain monohydric alcohols, or require special milling to obtain transparency.
  • Transparent bars which contain lower levels of soap are also known in the art. "Lower soap" transparent bars contain less than 40 parts of soap.
  • Patent 5,002,685 to Chambers et al discloses a transparent bar made with 25 to 34 % soap, 5 to 15 % monohydric alcohol, 15 to 30 % sugar and/or cyclic polyol, and 15 to 30 % water.
  • transparent bars which are prepared according to a process, such as that described by Chambers et al., which requires the use of monohydric alcohols in the preparation of the transparent bar, are prone to excessive weight loss due to the volatile nature of most alcohols.
  • Such transparent bars are also more expensive to prepare and require special equipment designed to accommodate the explosion hazard associated with most monohydric alcohols.
  • This invention relates to a monohydric-alcohol- free process for making pour molded transparent and translucent personal cleansing bars which exhibit good hardness characteristic.
  • This invention relates to a monohydric alcohol free process for making transparent pour molded personal cleansing bars which exhibit good hardness characteristics.
  • the process comprises: (I) making a molten mixture of from 18 parts to 35 parts soap, wherein said soap is at least 50 % insoluble sodium soap; from 14 parts to 32 parts water; from 5 parts to 37 parts synthetic surfactant ; and from 18 parts to 37 parts of a water soluble organic solvent, wherein the combined level of water and water soluble organic solvent within the molten mixture is at least 40 parts; and (II) transferring a unit amount of said molten mixture into a bar forming mold or tube and (III) allowing said molded unit to cool in acquiescent conditions into a mild, low smearing transparent personal cleansing bar.
  • the preferred bars made by the process of the present invention are more weight stable than bars made with several parts of alcohol.
  • An important benefit of this invention is that bar processing time is substantially reduced by faster crystallization and faster bar stabilization.
  • This invention relates to an alcohol free process for making a transparent pour molded bar that exhibits good hardness characteristics.
  • the process comprises: (A) making a molten mixture of from 18 parts to 35 parts soap, wherein said soap is composed of at least 50% insoluble sodium soap; from 14 parts to 32 parts water; from 5 parts to 37 parts synthetic surfactant wherein said lathering synthetic surfactant has a critical micelle concentration equilibrium surface tension between 10 and 50 dynes/cm, as measured at 25°C; and from 18 parts to 37 parts of a water soluble organic solvent, wherein the combined level of water and water soluble organic solvent within the molten mixture is at least 40 parts; and (B) pouring said molten mixture into a bar forming mold or tube and allowing said poured molten mixture to cool in acquiescent conditions into a mild low smearing transparent personal cleansing bar.
  • a bar is considered to be transparent if 14 point type can be read through a 1 /4 inch thickness of the bar.
  • a bar is not transparent if 14 point type cannot be read through a 1 /4 inch thickness of the bar.
  • insoluble soap means a fatty acid sodium soap that is less soluble than sodium myristate.
  • the transparent bars made by the process of this invention do not contain monohydric alcohols and, thus, are very stable weight wise. Alcohol containing bars are prone to weight loss due to evaporation of the volatile alcohol. This is one benefit of excluding alcohol. Yet another benefit of excluding alcohol is that a simpler process may be used since processes using alcohol typically require special equipment designed to accommodate the explosion hazard associated with most monohydric alcohols. An alcohol free process is also more economical.
  • POUR MOLDED PROCESS This invention relates to an alcohol free process for making a transparent pour molded bar that exhibit good hardness characteristics.
  • the process comprises: (A) making a molten mixture of from 18 parts to 35 parts of soap; wherein said soap is at least 50% insoluble sodium soap; from 14 parts to 32 parts water; from 5 parts to 37 parts synthetic surfactant wherein said lathering synthetic surfactant has a critical micelle concentration equilibrium surface tension between 10 and 50 dynes/cm, as measured at 25°C; and from 18 parts to 37 parts of a water soluble organic solvent, wherein the combined level of water and water soluble organic solvent within the molten mixture is at least 40 parts; and (B) transferring a unit amount of said molten mixture into a bar forming mold or tube and allowing said molded unit to cool in acquiescent conditions into a mild low smearing transparent personal cleansing bar.
  • a preferred alcohol free process comprises the following steps: 1 .
  • step 4 Add enough caustic solution to mix of step 3 to saponify the fatty material and to provide a low level of free caustic (e.g., 0.01 to 0.07%) after saponification/neutralization. This low level of residual caustic will ensure that all the fatty material has reacted. This is important to achieve the desired transparency and bar hardness since low levels of unreacted fatty material (particularly trigl ⁇ ceride) can affect these properties negatively. Cool if needed to prevent boiling; but maintain a molten mix;
  • step 4 Add some free fatty acid (at least enough to neutralize all the free caustic) and, optionally, other synthetic surfactants to mix of step 4.
  • a preferred process is a framed bar process. Other processes such as injection molding can be used.
  • the transparent bars prepared according to the process of the present invention comprise from about 18 parts to about 35 parts, preferably from about 20 parts to about 32 parts, more preferably from about 24 parts to about 32 parts soap. Surprisingly, at soap levels above about 35 parts a transparent bar is not produced, and at soap levels below about 18 parts the bar is unacceptably soft.
  • the soap mixture used in the process of this invention comprises at least 50% insoluble sodium soap, preferably from 50 % to about 87 % insoluble sodium soap, more preferably from about 53% to about 72% insoluble sodium soap.
  • Transparent bars wherein the soap component contains less than 50% insoluble soap can be undesirably soft.
  • the term "insoluble soap” is defined herein as: A fatty acid sodium soap that is less soluble than sodium myristate.
  • the term “insoluble soap” refers to monovalent salts of saturated fatty monocarboxylic acids having a carbon chain length of from 16 to 24, preferably from 16 to 18.
  • the preferred insoluble fatty acid soap is selected from the group consisting of sodium palmitate and sodium stearate and mixtures thereof. Other insoluble soaps, particularly, higher fatty acid insoluble soaps, can also be used. The remainder of the soap mixture is soluble soap.
  • soluble soap refers to the monovalent salts of saturated fatty monocarboxylic acids having a carbon chain length of from 8 to 14 and additionally the monovalent salts of oleic acid and unsaturated fatty monocarboxylic acids having a carbon chain length of between 8 and 22.
  • the preferred soluble soaps are selected from the group consisting of: myristic, oleic and lauric acid soaps and mixtures thereof.
  • the fatty acid soap used in the transparent bars of the present invention can be made using either pure chain fatty acids, mono-, di-, or triglycerides or oils, or by using the proper levels and ratios of common fatty acid and oil mixtures such as coconut, palm oil stearin, tallow, and triple pressed stearic.
  • the term "coconut” is defined herein in connection with soap or fatty acid mixtures to refer to materials having an approximate carbon chain length distribution of: 8 % Cs; 7 % C -J Q; 48 % C-) 2," 17.5 % C-14; 9 % C-i e; 2 % C-
  • coconut soap thus comprises approximately 1 1 % insoluble soap and 89 % soluble soap.
  • babassu is defined herein in connection with soap or fatty acid mixtures to refer to materials having an approximate carbon chain length distribution of: 6 % Cg; 3 % C-J Q; 46 % C12; 20 % C14; 7 % C-
  • Babassu soap thus comprises approximately 7 % insoluble soap and 93 % soluble soap.
  • triple pressed stearic refers to fatty acids having an approximate chain length distribution of 5 % myristic
  • Triple pressed stearic soap thus comprises approximately 95 % insoluble soap and 5
  • hardened tallow is defined herein to refer to fatty materials having an approximate chain length distribution of 3 % myristic (C14), 50 % palmitic (C16) and 45 % stearic (C18), and 2% oleic. Hardened tallow soap thus comprises approximately 95 % insoluble soaps and 5 % soluble soaps.
  • Tallow is defined (normalized mid range values from Table 6.34 Bailey's Industrial Oil and Fat Products, Volume 1 , Wiley Intersciences) as a mixture of soaps having an approximate chain length distribution of: 4 % C14; 29 % C16; 20 % C18; 2 % palmitoleic; 42 % oleic and 3 % linoleic. Tallow soap thus comprises approximately 49 % insoluble soap and 51 % soluble soap.
  • the amount of free fatty acid incorporated into the finished bars prepared by the process of the invention typically ranges from 0.5 parts to 3 parts, more typically from 1 to 2 parts. However, no free fatty acid is required.
  • the free fatty acid component is preferably introduced into the soap mixtures used in the present invention by addition of fatty acid to the soap mixtures after the saponification of the soap mixture has taken place.
  • the free fatty acid component can also be introduced as a prepared mixture of soap and free fatty acid, such as an acid-reacting mixture of soap and free fatty acid prepared by under-neutralization in the soap making process.
  • the fatty acid soap used in the present invention comprises sodium soaps.
  • low levels of non-sodium soaps such as potassium, magnesium, and/or triethanolammonium (TEA) soaps are permissible.
  • Such non-sodium soaps, when used, are preferably used at a level of from 0 to 10 parts, preferably from 0 to 5 parts by weight of the bar soap.
  • the water level in the transparent bars prepared by the process of the present invention ranges from about 14 parts to about 32 parts, preferably from about 18 parts to about 27 parts, more preferably from about 22 parts to about 26 parts.
  • the higher levels of water within these preferred ranges are more preferred for processing ease, bar mildness and other advantages.
  • the water level within the personal cleansing bars prepared by the process of the present invention is critical to obtain a transparent bar having desirable hardness characteristics.
  • the bar may not be transparent.
  • the level of water present in the bar exceeds about 32 parts by weight of the bar, the bar can be unacceptably soft.
  • SURFACTANT The lathering synthetic surfactant level in the transparent bars prepared according to the process of the present invention ranges from about 5 parts to about 37 parts, preferably from about 10 parts to about 28 parts, more preferably from about 12 parts to about 22 parts by weight of the finished bar.
  • the synthetic surfactant is necessary for improving bar characteristics. Some of these characteristics include lathering/sudsing properties, bar mildness, rinse feel of the bar, and smear/hardness characteristics.
  • the bar composition comprises a lathering synthetic surfactant selected from the group consisting of anionic surfactants; nonionic surfactants, zwitterionic surfactants, amphoteric surfactants, and mixtures thereof.
  • the lathering surfactant is defined herein as a synthetic surfactant or a mixtures of surfactants that has an equilibrium surface tension of between 10 and 50 dynes/cm, more preferably between 20 and 45 dynes/cm as measured at the CMC (critical micelle concentration) at 25°C. Some surfactant mixtures have surface tensions lower than some of its components. Thereby both low and high lathering and high and low water-soluble surfactants can be used in the bar compositions of the present invention.
  • Suds boosting synthetic detergent surfactants and/or synthetic detergent surfactants that are known as good dispersants for soap curds that are formed in hard water, are particularly desirable.
  • a preferable selection of lathering synthetic surfactant would include a mixture of anionic and zwitterionic/amphoteric surfactants.
  • the addition of the zwitterionic/amphoteric surfactant allows for increased mildness and lather properties. However, this addition also can lead to worse structure forming properties in the bar, so that the amount of amphoteric surfactant should be kept to less than 10 parts.
  • Preferred zwitterionic/amphoteric surfactants are selected from alkyl ampho mono and di-acetates, alkyl betaines, alkyl sultaines, alkyl amidopropyl betaines, alkyl amidopropyl hydroxysultaines, and mixtures thereof, wherein said surfactants contain C8 to C22 alkyl chains and mixtures thereof.
  • Suitable synthetic surfactants for use herein are those described in U.S. Pat. No. 3,351 ,558, Zimmerer, issued Nov. 7, 1967, at column 6, line 70 to column 7, line 74, incorporated herein by reference; and U.S. Patent 4,165,293 to Gordon, issued Aug. 21 , 1979; U.S. Patent 5,002,685 to Chambers and Instone, issued Mar. 26, 1991 ; U.S. Patent 5,041 ,234 to Instone, et al., issued Aug. 20, 1991 ; all incorporated herein by reference in their entirety.
  • alkyl sulfates include alkyl sulfates, anionic acyl sarcosinates, methyl acyl taurates, N- ac ⁇ l glutamates, acyl isethionates, alkyl sulfosuccinates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, trideceth sulfates, protein condensates, mixtures of ethoxylated alkyl sulfates and alkyl amine oxides, betaines, sultaines, and mixtures thereof.
  • Some preferred surfactants are the alkyl ether sulfates with 1 to 12 ethoxy groups, especially ammonium and sodium lauryl ether sulfates.
  • Synthetic sulfate detergents of special interest are the normally solid alkali metal salts of sulfuric acid esters of normal primary aliphatic alcohols having from 10 to 22 carbon atoms.
  • the sodium and potassium salts of alkyl sulfuric acids obtained from the mixed higher alcohols derived by the reduction of tallow or by the reduction of coconut oil, palm oil, palm kernel oil, palm oil stearin, babassu kernel oil or other oils of the coconut group can be used herein.
  • the preferred lathering synthetic surfactant is selected from the group consisting of: acyl isethionates, acyl sarcosinates, alkylglycerylether sulfonates, methylacyl taurates, paraffin sulfonates, linear alkyl benzene sulfonates, N-acyl glutamates, alkyl sulfosuccinates, alpha suifo fatty acid esters, alkyl ether carboxylates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, alpha olefin sulphonate, the alkyl ether sulfates (with 1 to 12 ethox ⁇ groups), and mixtures thereof, wherein said surfactants contain C8 to C22 alkyl chain.
  • the anionic surfactant is more preferred wherein said surfactants contain C8 to C18 alkyl chains and wherein the counterion is selected from the group consisting of
  • Some examples of good mild, lather-enhancing, synthetic detergent surfactants are, e.g., sodium lauroyl sarcosinate, alkyl glyceryl ether sulfonate, sulfonated fatty esters, and sulfonated fatty acids
  • surfactant mildness can be measured by a skin barrier destruction test which is used to assess the irritancy potential of surfactants. In this test the milder the surfactant, the less the skin barrier is destroyed. Skin barrier destruction is measured by the relative amount of radio-labeled water (3H-H2O) which passes from the test solution through the skin epidermis into the physiological buffer contained in the diffusate chamber. This test is described by T. J. Franz in the J. Invest. Dermatol.. 1975, 64, pp. 190-195; and in U.S. Pat. No. 4,673,525, Small et al., issued June 16, 1987, incorporated herein by reference.
  • 3H-H2O radio-labeled water
  • the transparent bar prepared according to the process of the present invention comprises from about 18 parts to about 37 parts, preferably from about 20 parts to about 32 parts, more preferably from about 20 parts to about 28 parts, of a water soluble organic solvent.
  • the water soluble organic solvent is preferably selected from the group consisting of urea, water soluble organic polyol and mixtures thereof.
  • Urea can be used at a level of 0 to 8 parts, preferable 2 to 7 parts or 3 to 6 parts, but the total level of polyol and urea preferably should not exceed about 37 parts.
  • Preferred water soluble organic polyols are selected from the group consisting of: propylene glycol, dipropylene glycol, butylene glycol, glycerine and ethylene glycol, 1 ,7- heptane-diol, mono and polyethylene and propylene glycols of up to 8,000 molecular weight, mono-C1-4 alkyl ethers thereof, sorbitol, glycerol, mono- di- and triethanolamine, 2-amino-1-butanol, non- reducing sugars, such as sucrose, and mixtures thereof.
  • the preferred non reducing sugar is used at a level of from about 1 part to about 10 parts, preferably from about 2 parts to about 7 parts, by weight of the bar.
  • sucrose as used herein includes sucrose, its derivatives, and similar non-reducing sugars and similar polyols which are substantially stable at a soap processing temperature of up to about 210°F (99°C), e.g., trialose, raffinose, and stachyose; and sorbitol, lactitol and maltitol.
  • the water-soluble organic solvent is a necessary component of the transparent bars prepared according to the process of the present invention, required for bar transparency. Moreover, the particular level and type of water soluble organic solvent employed are important to optimization of the transparency of the personal cleansing bar. COMBINATION OF COMPONENTS
  • the personal cleansing bars prepared according to the process of the present invention must contain certain combined levels of soap and water soluble organic solvent.
  • the water soluble organic solvent, water and soap be combined within the bar at certain ratios.
  • the water and the water soluble organic solvent are preferably combined at a ratio of about 2: 1 to 1 :2, most preferably about 1 : 1 , to maintain transparency.
  • the soap and the water soluble solvent are preferably combined at a ratio of about 0.8:1 to about 2: 1 , more preferably from about 0.8:1 to 1.5:1.
  • the ratio of the insoluble soap to soluble soap preferably ranges from about 1.2:1 to about 2.4: 1 , more preferably from about 1.7:1 to about 2.3:1.
  • the bar soap compositions prepared according to the process of the present invention can contain other additives commonly included in toilet bars such as perfumes, other fillers, sanitizing or anti microbial agents, dyes, and the like.
  • Some preferred bars of this invention contain at least 1 parts of another bar ingredient selected from: moisturizers, colorants, fillers, polymeric skin feel and mildness aids, perfumes, preservatives, and mixtures thereof.
  • Compatible salt and salt hydrates can be used as fillers.
  • Some preferred salts are sodium chloride, sodium sulfate, disodium hydrogen phosphate, sodium pyrophosphate, sodium tetraborate.
  • compatible salts and salt hydrates include the sodium, potassium, magnesium, calcium, aluminum, lithium, and ammonium salts of inorganic acids and small (6 carbons or less) carboxylic or other organic acids, corresponding hydrates, and mixtures thereof, are applicable.
  • the inorganic salts include chloride, bromide, sulfate, metasilicate, orthophosphate, pyrophosphate, polyphosphate, metaborate, tetraborate, and carbonate.
  • the organic salts include acetate, formate, methyl sulfate, and citrate.
  • Water-soluble amine salts can also be used. Monoethanolamine, diethanolamine, and triethanolamine (TEA) chloride salts are preferred.
  • Aluminosilicates and other clays are useful in the present invention. Some preferred clays are disclosed in U.S. Pat. Nos. 4,605,509 and 4,274,975, incorporated herein by reference.
  • clays include zeolite, kaolinite, montmorillonite, attapulgite, illite, bentonite, and halloysite.
  • Another preferred clay is kaolin.
  • the following process is used to make the exemplified framed bars.
  • the process comprises the following steps: 1. Making a molten mixture batch step by step as indicated below. 2. Pouring molten mixture product in bar molds or tubes. 3. Cooling of bars in acquiescent conditions at an average cooling rate of 0.1 to 7.0°C per minute to promote crystallization/solidification.
  • amphoteric surfactants e.g., Coco Betaine
  • water e.g., water, and salts (e.g., Sodium Chloride)
  • salts e.g., Sodium Chloride
  • caustic solution e.g., 30 % Sodium Hvdroxide
  • the temperatures listed in the batch making procedure are approximates.
  • the temperatures in the process can vary some, e.g., they may vary within 5 degrees C.
  • the key is not to allow the molten mix viscosity to get too high (e.g., below 68°C), and to avoid agitation while cooling the mix in the proximity of this temperature range.
  • the following processing conditions were used to make this bar:
  • the above product is also cooled at average cooling rates of approximately 0.7, 0.3 and 0.06°C per minute.
  • the slowest cooling rate (0.06 °C per minute) results in opaque bars while the other two produced transparent bars.
  • the pour molded personal cleansing bar of this Example 1 had a weight loss of less than 4 % after being stored at room temperature (21 °C) for six months. This weight loss is considered acceptable in the industry, and is significantly lower than that typically experienced by monohydric alcohol-containing personal cleansing bars.
  • a soap bar originally containing 42.5 parts of at least 50 % soluble soap, 9.0 parts ethanol, 22.3 parts water and 19.5 parts of a combination of water soluble polyols experienced a weight loss higher than 4 % after only two months of storage at room temperature (21 °C) conditions, and experienced a weight loss in excess of 12 % after six months of being stored at this conditions.
  • This bar has excellent transparency, hardness and sudsing characteristics. The bar is also very mild.
  • a molten mix comprising the above composition is cooled in solidification tubes from a temperature of 72°C to a solidification temperature of about 50°C at an average cooling rate of 0.2°C per minute.
  • the molten mix is separately poured in bar shaped molds at a temperature of 72 °C and cooled in acquiescent conditions inside a cooling tunnel at an average rate of 1.3°C per minute. In both cases, the bars obtained showed excellent properties.
  • a molten mix of the same composition is initially cooled from 82°C to a temperature of 65°C in presence of agitation. The mix is then poured in molds and cooled in acquiescent conditions at an average cooling rate of 1.3°C per minute. The resulting bars are not transparent, but they retain good hardness and sudsing properties.
  • This example has a higher amount of soap and a lower amount of water.
  • This bar was made with a mixture of triglycerides (Coconut Oil) and fatty acids (Triple Pressed Stearic fatty acid).

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Abstract

Procédé ne nécessitant pas l'utilisation d'alcools monovalents, permettent de produire des barres transparentes pour l'hygiène personnelle, moulées par coulée, qui possèdent de bonnes caractéristiques de dureté. Ledit procédé consiste: (I) à produire un mélange fondu comprenant de 18 parties à 35 parties de savon, ledit savon contenant au moins 50 % de savon de sodium insoluble, de 14 parties à 32 parties d'eau, de 5 parties à 37 parties de tensioactif synthétique et de 18 parties à 37 parties d'un solvant organique hydrosoluble, le taux combiné d'eau et de solvant organique hydrosoluble dans le mélange fondu étant d'au moins 40 parties; (II) à transférer une quantité unitaire dudit mélange fondu dans un moule ou tube de formation de barre; et (III) à laisser ladite unité moulée refroidir dans des conditions appropriées pour obtenir une barre transparente pour l'hygiène personnelle douce et à faible ramollissement. Les barres préférées fabriquées selon le procédé présenté sont plus stables en poids que les barres constituées de plusieurs parties d'alcool. Un avantage important de la présente invention est que le temps de traitement est considérablement réduit grâce à une vitesse accrue de cristallisation et de stabilisation des barres.
EP95928144A 1994-08-03 1995-07-26 Procede de fabrication de barres transparentes pour l'hygiene personnelle Ceased EP0775195A1 (fr)

Applications Claiming Priority (3)

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US285261 1988-12-16
US28526194A 1994-08-03 1994-08-03
PCT/US1995/009437 WO1996004361A1 (fr) 1994-08-03 1995-07-26 Procede de fabrication de barres transparentes pour l'hygiene personnelle

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US (1) US5703025A (fr)
EP (1) EP0775195A1 (fr)
JP (1) JPH10504336A (fr)
KR (1) KR100235691B1 (fr)
CN (1) CN1157633A (fr)
AU (1) AU3200995A (fr)
BR (1) BR9508501A (fr)
CA (1) CA2196612C (fr)
CZ (1) CZ31997A3 (fr)
EG (1) EG20691A (fr)
HU (1) HUT78015A (fr)
MX (1) MX9700842A (fr)
PE (1) PE2797A1 (fr)
TR (1) TR199500951A2 (fr)
TW (1) TW340871B (fr)
WO (1) WO1996004361A1 (fr)

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TR199500951A2 (tr) 1996-06-21
TW340871B (en) 1998-09-21
BR9508501A (pt) 1998-11-03
EG20691A (en) 1999-11-30
CA2196612A1 (fr) 1996-02-15
MX9700842A (es) 1997-04-30
WO1996004361A1 (fr) 1996-02-15
HUT78015A (hu) 1999-05-28
PE2797A1 (es) 1997-03-26
CA2196612C (fr) 2001-12-18
AU3200995A (en) 1996-03-04
CZ31997A3 (en) 1997-10-15
CN1157633A (zh) 1997-08-20
US5703025A (en) 1997-12-30
JPH10504336A (ja) 1998-04-28
KR100235691B1 (ko) 1999-12-15

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